mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
268 lines
8.3 KiB
ArmAsm
268 lines
8.3 KiB
ArmAsm
/* RISC-V PLT trampoline
|
|
Copyright (C) 2017-2024 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <sys/asm.h>
|
|
|
|
#include "dl-link.h"
|
|
|
|
/* Assembler veneer called from the PLT header code for lazy loading.
|
|
The PLT header passes its own args in t0-t2. */
|
|
|
|
#ifdef __riscv_float_abi_soft
|
|
# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
|
|
#else
|
|
# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
|
|
#endif
|
|
|
|
ENTRY (_dl_runtime_resolve)
|
|
# Save arguments to stack.
|
|
addi sp, sp, -FRAME_SIZE
|
|
REG_S ra, 9*SZREG(sp)
|
|
REG_S a0, 1*SZREG(sp)
|
|
REG_S a1, 2*SZREG(sp)
|
|
REG_S a2, 3*SZREG(sp)
|
|
REG_S a3, 4*SZREG(sp)
|
|
REG_S a4, 5*SZREG(sp)
|
|
REG_S a5, 6*SZREG(sp)
|
|
REG_S a6, 7*SZREG(sp)
|
|
REG_S a7, 8*SZREG(sp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_S fa0, (10*SZREG + 0*SZFREG)(sp)
|
|
FREG_S fa1, (10*SZREG + 1*SZFREG)(sp)
|
|
FREG_S fa2, (10*SZREG + 2*SZFREG)(sp)
|
|
FREG_S fa3, (10*SZREG + 3*SZFREG)(sp)
|
|
FREG_S fa4, (10*SZREG + 4*SZFREG)(sp)
|
|
FREG_S fa5, (10*SZREG + 5*SZFREG)(sp)
|
|
FREG_S fa6, (10*SZREG + 6*SZFREG)(sp)
|
|
FREG_S fa7, (10*SZREG + 7*SZFREG)(sp)
|
|
#endif
|
|
|
|
# Update .got.plt and obtain runtime address of callee.
|
|
slli a1, t1, 1
|
|
mv a0, t0 # link map
|
|
add a1, a1, t1 # reloc offset (== thrice the .got.plt offset)
|
|
la a2, _dl_fixup
|
|
jalr a2
|
|
mv t1, a0
|
|
|
|
# Restore arguments from stack.
|
|
REG_L ra, 9*SZREG(sp)
|
|
REG_L a0, 1*SZREG(sp)
|
|
REG_L a1, 2*SZREG(sp)
|
|
REG_L a2, 3*SZREG(sp)
|
|
REG_L a3, 4*SZREG(sp)
|
|
REG_L a4, 5*SZREG(sp)
|
|
REG_L a5, 6*SZREG(sp)
|
|
REG_L a6, 7*SZREG(sp)
|
|
REG_L a7, 8*SZREG(sp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_L fa0, (10*SZREG + 0*SZFREG)(sp)
|
|
FREG_L fa1, (10*SZREG + 1*SZFREG)(sp)
|
|
FREG_L fa2, (10*SZREG + 2*SZFREG)(sp)
|
|
FREG_L fa3, (10*SZREG + 3*SZFREG)(sp)
|
|
FREG_L fa4, (10*SZREG + 4*SZFREG)(sp)
|
|
FREG_L fa5, (10*SZREG + 5*SZFREG)(sp)
|
|
FREG_L fa6, (10*SZREG + 6*SZFREG)(sp)
|
|
FREG_L fa7, (10*SZREG + 7*SZFREG)(sp)
|
|
#endif
|
|
|
|
addi sp, sp, FRAME_SIZE
|
|
|
|
# Invoke the callee.
|
|
jr t1
|
|
END (_dl_runtime_resolve)
|
|
|
|
#if !defined PROF && defined SHARED
|
|
ENTRY (_dl_runtime_profile)
|
|
/* RISC-V we get called with:
|
|
t0 linkr_map pointer
|
|
t1 the scaled offset stored in t0, which can be used
|
|
to calculate the offset of the current symbol in .rela.plt
|
|
t2 %hi(%pcrel(.got.plt)) stored in t2, no use in this function
|
|
t3 dl resolver entry point, no use in this function
|
|
|
|
Stack frame layout with hard float:
|
|
RV64 RV32
|
|
[sp, #96] [sp, #48] La_riscv_regs
|
|
[sp, #48] [sp, #24] La_riscv_retval
|
|
[sp, #40] [sp, #20] frame size return from pltenter
|
|
[sp, #32] [sp, #16] dl_profile_call saved a1
|
|
[sp, #24] [sp, #12] dl_profile_call saved a0
|
|
[sp, #16] [sp, #8] T1
|
|
[sp, #0] [sp, #0] ra, fp <- fp
|
|
*/
|
|
|
|
# define OFFSET_T1 2*SZREG
|
|
# define OFFSET_SAVED_CALL_A0 OFFSET_T1 + SZREG
|
|
# define OFFSET_SAVED_CALL_A1 OFFSET_SAVED_CALL_A0 + SZREG
|
|
# define OFFSET_FS OFFSET_SAVED_CALL_A1 + SZREG
|
|
# define OFFSET_RV OFFSET_FS + SZREG
|
|
# define OFFSET_RG OFFSET_RV + DL_SIZEOF_RV
|
|
|
|
# define SF_SIZE (-(-(OFFSET_RG + DL_SIZEOF_RG) & ALMASK))
|
|
|
|
# Save arguments to stack.
|
|
add sp, sp, -SF_SIZE
|
|
REG_S ra, 0(sp)
|
|
REG_S fp, SZREG(sp)
|
|
|
|
mv fp, sp
|
|
|
|
REG_S a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
|
|
REG_S a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
|
|
REG_S a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
|
|
REG_S a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
|
|
REG_S a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
|
|
REG_S a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
|
|
REG_S a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
|
|
REG_S a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_S fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
|
|
FREG_S fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
|
|
FREG_S fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
|
|
FREG_S fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
|
|
FREG_S fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
|
|
FREG_S fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
|
|
FREG_S fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
|
|
FREG_S fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
|
|
#endif
|
|
|
|
# Update .got.plt and obtain runtime address of callee.
|
|
slli a1, t1, 1
|
|
mv a0, t0
|
|
add a1, a1, t1 # link map
|
|
mv a2, ra # return addr
|
|
addi a3, fp, OFFSET_RG # La_riscv_regs pointer
|
|
addi a4, fp, OFFSET_FS # frame size return from pltenter
|
|
|
|
REG_S a0, OFFSET_SAVED_CALL_A0(fp)
|
|
REG_S a1, OFFSET_SAVED_CALL_A1(fp)
|
|
|
|
la t2, _dl_profile_fixup
|
|
jalr t2
|
|
|
|
REG_L t3, OFFSET_FS(fp)
|
|
bgez t3, 1f
|
|
|
|
# Save the return.
|
|
mv t4, a0
|
|
|
|
# Restore arguments from stack.
|
|
REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
|
|
REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
|
|
REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
|
|
REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
|
|
REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
|
|
REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
|
|
REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
|
|
REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
|
|
FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
|
|
FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
|
|
FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
|
|
FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
|
|
FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
|
|
FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
|
|
FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
|
|
#endif
|
|
|
|
REG_L ra, 0(fp)
|
|
REG_L fp, SZREG(fp)
|
|
|
|
addi sp, sp, SF_SIZE
|
|
jr t4
|
|
|
|
1:
|
|
# The new frame size is in t3.
|
|
sub sp, fp, t3
|
|
andi sp, sp, ALMASK
|
|
|
|
REG_S a0, OFFSET_T1(fp)
|
|
|
|
mv a0, sp
|
|
addi a1, fp, SF_SIZE
|
|
mv a2, t3
|
|
la t4, memcpy
|
|
jalr t4
|
|
|
|
REG_L t4, OFFSET_T1(fp)
|
|
|
|
# Call the function.
|
|
REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
|
|
REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
|
|
REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
|
|
REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
|
|
REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
|
|
REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
|
|
REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
|
|
REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
|
|
FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
|
|
FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
|
|
FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
|
|
FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
|
|
FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
|
|
FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
|
|
FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
|
|
#endif
|
|
jalr t4
|
|
|
|
REG_S a0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0(fp)
|
|
REG_S a1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0 + SZREG(fp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_S fa0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0(fp)
|
|
FREG_S fa1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0 + SZFREG(fp)
|
|
#endif
|
|
|
|
# Setup call to pltexit.
|
|
REG_L a0, OFFSET_SAVED_CALL_A0(fp)
|
|
REG_L a1, OFFSET_SAVED_CALL_A0 + SZREG(fp)
|
|
addi a2, fp, OFFSET_RG
|
|
addi a3, fp, OFFSET_RV
|
|
la t4, _dl_audit_pltexit
|
|
jalr t4
|
|
|
|
REG_L a0, OFFSET_RV + DL_OFFSET_RV_A0(fp)
|
|
REG_L a1, OFFSET_RV + DL_OFFSET_RV_A0 + SZREG(fp)
|
|
|
|
#ifndef __riscv_float_abi_soft
|
|
FREG_L fa0, OFFSET_RV + DL_OFFSET_RV_FA0(fp)
|
|
FREG_L fa1, OFFSET_RV + DL_OFFSET_RV_FA0 + SZFREG(fp)
|
|
#endif
|
|
|
|
# RA from within La_riscv_reg.
|
|
REG_L ra, OFFSET_RG + DL_OFFSET_RG_RA(fp)
|
|
mv sp, fp
|
|
ADDI sp, sp, SF_SIZE
|
|
REG_S fp, SZREG(fp)
|
|
|
|
jr ra
|
|
|
|
END (_dl_runtime_profile)
|
|
#endif /* SHARED */
|